java - 我想使用一条语句，如果值是 X 则显示弹出窗口 "Time UP Please Order Tomorrow"

Question

我想在我的主要 Activity 中添加一个函数，应用程序将获取设备时间。如果设备时间大于下午 2:00 或设备时间小于上午 08:00。启动屏幕后将显示一个弹出窗口“抱歉，时间已到，请明天上午 08:00 至下午 02:00 订购”。以及退出应用程序的“确定”按钮。

回答后我更新了我的 Splash Activity 。但什么也没发生。 `public void onCreate(Bundle savingInstanceState) { super.onCreate(savedInstanceState);

    // **************** ORDER SLOT ******************* //
    Calendar finalTime = Calendar.getInstance();

    Calendar mCalendarOpeningTime = Calendar.getInstance();
    mCalendarOpeningTime.set(Calendar.HOUR, 10);
    mCalendarOpeningTime.set(Calendar.MINUTE, 59);
    mCalendarOpeningTime.set(Calendar.AM_PM, Calendar.AM);

    Calendar mCalendarClosingTime = Calendar.getInstance();
    mCalendarClosingTime = Calendar.getInstance();
    mCalendarClosingTime.set(Calendar.HOUR, 11);
    mCalendarClosingTime.set(Calendar.MINUTE, 00);
    mCalendarClosingTime.set(Calendar.AM_PM, Calendar.AM);


    if (finalTime.after(mCalendarOpeningTime)&&finalTime.before(mCalendarClosingTime)){
        // show the dialog
        AlertDialog.Builder builder = new AlertDialog.Builder(SplashScreen.this);
        builder.setTitle(R.string.app_name);
        builder.setIcon(R.mipmap.ic_launcher);
        builder.setMessage("Order Full, Please Order Tomorrow before 02:00PM")
                .setCancelable(false)
                .setPositiveButton("Exit", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int id) {
                        finish();
                    }
                });
    }

Answer 1

嗯，有太多方法可以做到这一点。如果您想从互联网上获取时间，您可以使用 TrueTime 。根据您的请求，您可以使用 Date 实例:

 private void setOpeningAndClosingTimes() {
        //current time
        Calendar finalTime = Calendar.getInstance();

        Calendar mCalendarOpeningTime = Calendar.getInstance();
        mCalendarOpeningTime.set(Calendar.HOUR, 8);
        mCalendarOpeningTime.set(Calendar.MINUTE, 0);
        mCalendarOpeningTime.set(Calendar.AM_PM, Calendar.AM);

        Calendar mCalendarClosingTime = Calendar.getInstance();
        mCalendarClosingTime = Calendar.getInstance();
        mCalendarClosingTime.set(Calendar.HOUR, 2);
        mCalendarClosingTime.set(Calendar.MINUTE, 00);
        mCalendarClosingTime.set(Calendar.AM_PM, Calendar.PM);




       if (finalTime.after(mCalendarOpeningTime)&&finalTime.before(mCalendarClosingTime)){
       // show the dialog

        Toast.makeText(this,"Time is 8Am to 2PM",Toast.LENGTH_LONG).show();

    }else {
        AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
        builder.setTitle(R.string.app_name);
        builder.setIcon(R.mipmap.ic_launcher);
        builder.setMessage("Order Full, Please Order Tomorrow before 02:00PM")
                .setCancelable(false)
                .setPositiveButton("Exit", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int id) {
                        finish();
                    }
                });
        builder.show();
    }

现在在 onCreate() 或 onStart() 中调用此方法，以便在开始使用它们之前将值分配给相应的“时间”: